2D CSEM Movie of Complex Reservoir and Salt Body Model

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This movie shows the electric field amplitude and direction versus time for the complex 2D model I created for the paper on the MARE2DCSEM modeling code (Li and Key, 2007). Only the central portion of the model is shown in the movie. The time varying electric field amplitude is plotted as shaded colors and the field direction is shown as time varying vectors. It is easy to see that the EM energy diffuses fastest through the resistive reservoir and resistive salt body and that some energy diffuses down from the air (above 0 km depth). Inside the reservoir, the electric field is vertically polarized. Along the inside edges of the salt body, the electric field is polarized normal to the salt boundary. While the electric field amplitudes are larger inside the resistors, the eddy currents flowing inside the resistors will be much smaller than in the surrounding conductive sediments.

Below is the model used to compute the CSEM fields. The reservoir and salt body are 100 Ohm-m and the surrounding sediments have resistivities of around 1--3 Ohm-m. The CSEM fields were computed at a frequency of 0.1 Hz.